Analysis of Risk Factors for High-Risk Patients Undergoing Total Joint Arthroplasty.

Background: The purpose of this study is to evaluate and redefine patients at high risk for increased resource utilization and complications after total joint arthroplasty (TJA), so interventions may focus on patients standing to receive the most benefit. Material and methods: This is a retrospective study of 787 patients undergoing primary unilateral TJA from September 1, 2020, to September 31, 2021. Patients were deemed to be at "high risk" based on criteria derived from published literature and triaged to an enhanced preoperative education program. Patients that were discharged to a skilled nursing facility, had a length of stay ≥ 2 days, returned to the emergency department, or readmitted within 30 days were classified as having a composite outcome. A univariate analysis compared patients who did and did not experience the composite outcome, and multivariate regression was performed to evaluate predictors of this endpoint. Results: Differences in rates of 5 of the 28 risk factors were present between patients who did and did not experience composite outcomes. After controlling for other factors, African American race, planned discharge to skilled nursing facility, mental health conditions or drug use, cardiac, and neurologic conditions were predictive of the composite outcome. Patients who were reclassified as "high risk" with 1 or more of these characteristics, experienced longer length of stay and lower rates of home discharge than the rest of the population. Conclusion: This study presents a profile of high-risk TJA patients that can be incorporated into clinical practice for risk stratification and targeted intervention.